docs: def _change_height(self, ax, new_value):
          """Make bars in horizontal bar chart thinner"""
          for patch in ax.patches:
              current_height = patch.get_height()
              diff = current_height - new_value
  
              # we change the bar height
              patch.set_height(new_value)
  
              # we recenter the bar
              patch.set_y(patch.get_y() + diff * .5)